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激光金属沉积高熵合金涂层在赫利舍迪地热电站的抗侵蚀和耐腐蚀性能

Erosion and Corrosion Resistance Performance of Laser Metal Deposited High-Entropy Alloy Coatings at Hellisheidi Geothermal Site.

作者信息

Thorhallsson Andri Isak, Fanicchia Francesco, Davison Emily, Paul Shiladitya, Davidsdottir Svava, Olafsson Dagur Ingi

机构信息

Innovation Centre Iceland, Árleynir 2-8, 112 Reykjavik, Iceland.

TWI Ltd., Granta Park, Cambridge CB21 6AL, UK.

出版信息

Materials (Basel). 2021 Jun 4;14(11):3071. doi: 10.3390/ma14113071.

DOI:10.3390/ma14113071
PMID:34199772
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8200011/
Abstract

Geothermal process equipment and accessories are usually manufactured from low-alloy steels which offer affordability but increase the susceptibility of the materials to corrosion. Applying erosion-corrosion-resistant coatings to these components could represent an economical solution to the problem. In this work, testing of two newly developed laser metal deposited high-entropy alloy (LMD-HEA) coatings-CoCrFeNiMo and AlCoCrFeNi, applied to carbon and stainless steels-was carried out at the Hellisheidi geothermal power plant. Tests in three different geothermal environments were performed at the Hellisheidi site: wellhead test at 194 °C and 14 bar, erosion test at 198 °C and 15 bar, and aerated test at 90 °C and 1 bar. Post-test microstructural characterization was performed via Scanning Eletron Microscope (SEM), Back-Scattered Electrons analysis (BSE), Energy Dispersive X-ray Spectroscopy (EDS), optical microscopy, and optical profilometry while erosion assessment was carried out using an image and chemical analysis. Both the CoCrFeNiMo and AlCoCrFeNi coatings showed manufacturing defects (cracks) and were prone to corrosion damage. Results show that damage in the CoCrFeNiMo-coated carbon steel can be induced by manufacturing defects in the coating. This was further confirmed by the excellent corrosion resistance performance of the CoCrFeNiMo coating deposited onto stainless steel, where no manufacturing cracks were observed.

摘要

地热处理设备及配件通常由低合金钢制造，这种钢材价格实惠，但会增加材料的腐蚀敏感性。在这些部件上涂覆抗冲蚀腐蚀涂层可能是解决该问题的一种经济方案。在这项工作中，在赫利舍迪地热发电厂对两种新开发的激光金属沉积高熵合金（LMD-HEA）涂层——CoCrFeNiMo和AlCoCrFeNi，涂覆在碳钢和不锈钢上进行了测试。在赫利舍迪场地进行了三种不同地热环境下的测试：194℃和14巴的井口测试、198℃和15巴的冲蚀测试以及90℃和1巴的曝气测试。测试后通过扫描电子显微镜（SEM）、背散射电子分析（BSE）、能量色散X射线光谱（EDS）、光学显微镜和光学轮廓仪进行微观结构表征，同时使用图像和化学分析进行冲蚀评估。CoCrFeNiMo和AlCoCrFeNi涂层均显示出制造缺陷（裂纹），并且容易受到腐蚀损坏。结果表明，CoCrFeNiMo涂层碳钢中的损坏可能是由涂层中的制造缺陷引起的。这通过涂覆在不锈钢上的CoCrFeNiMo涂层的优异耐腐蚀性能得到了进一步证实，在该不锈钢涂层上未观察到制造裂纹。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a109/8200011/8d86ba6bc7dc/materials-14-03071-g019.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a109/8200011/c749d91c76ab/materials-14-03071-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a109/8200011/a2e415b647fa/materials-14-03071-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a109/8200011/003eb64bb610/materials-14-03071-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a109/8200011/ca688ca651ef/materials-14-03071-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a109/8200011/08e5a1ebaa8d/materials-14-03071-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a109/8200011/7592df880d5b/materials-14-03071-g013.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a109/8200011/115806230f75/materials-14-03071-g014.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a109/8200011/0f70361cb0fe/materials-14-03071-g015.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a109/8200011/21f3d0528575/materials-14-03071-g016.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a109/8200011/19ce1b60f0f5/materials-14-03071-g017.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a109/8200011/e332b93d0e22/materials-14-03071-g018.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a109/8200011/8d86ba6bc7dc/materials-14-03071-g019.jpg

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